场景：建筑物、街道和树等静态对象。

Scenes: static objects, such as buildings, streets, and trees.

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新节点上的某些属性可以从消息树中的某个位置动态地取得其值，而不是需要在消息流编辑器中静态地设置其值。

Certain properties on new nodes can take their value dynamically from a location in the message tree, rather than requiring it to be set statically in the message Flow Editor.

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Doclet有静态start方法，并将解析树作为参数。

A Doclet has a static start method and takes the parse tree as an argument.

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